diff mbox

mmc: sdhci: use udelay instead of mdelay

Message ID 1407831568-23862-1-git-send-email-yunpeng.gao@intel.com (mailing list archive)
State New, archived
Headers show

Commit Message

Gao, Yunpeng Aug. 12, 2014, 8:19 a.m. UTC 
From: Chuanxiao Dong <chuanxiao.dong@intel.com>

This patch uses udelay instead of mdelay when waiting
for SDHC hardware to be stable. udelay can help to
reduce the waiting time when is in critical region
which is protected by spinlock.

Signed-off-by: Yunpeng Gao <yunpeng.gao@intel.com>
Signed-off-by: Chuanxiao Dong <chuanxiao.dong@intel.com>
---
 drivers/mmc/host/sdhci.c |   12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)
diff mbox

Patch

diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index 47055f3..74d8c42 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -179,7 +179,7 @@  void sdhci_reset(struct sdhci_host *host, u8 mask)
 	}
 
 	/* Wait max 100 ms */
-	timeout = 100;
+	timeout = 10000;
 
 	/* hw clears the bit when it's done */
 	while (sdhci_readb(host, SDHCI_SOFTWARE_RESET) & mask) {
@@ -190,7 +190,7 @@  void sdhci_reset(struct sdhci_host *host, u8 mask)
 			return;
 		}
 		timeout--;
-		mdelay(1);
+		udelay(10);
 	}
 }
 EXPORT_SYMBOL_GPL(sdhci_reset);
@@ -975,7 +975,7 @@  void sdhci_send_command(struct sdhci_host *host, struct mmc_command *cmd)
 	WARN_ON(host->cmd);
 
 	/* Wait max 10 ms */
-	timeout = 10;
+	timeout = 1000;
 
 	mask = SDHCI_CMD_INHIBIT;
 	if ((cmd->data != NULL) || (cmd->flags & MMC_RSP_BUSY))
@@ -996,7 +996,7 @@  void sdhci_send_command(struct sdhci_host *host, struct mmc_command *cmd)
 			return;
 		}
 		timeout--;
-		mdelay(1);
+		udelay(10);
 	}
 
 	timeout = jiffies;
@@ -1202,7 +1202,7 @@  clock_set:
 	sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
 
 	/* Wait max 20 ms */
-	timeout = 20;
+	timeout = 2000;
 	while (!((clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL))
 		& SDHCI_CLOCK_INT_STABLE)) {
 		if (timeout == 0) {
@@ -1212,7 +1212,7 @@  clock_set:
 			return;
 		}
 		timeout--;
-		mdelay(1);
+		udelay(10);
 	}
 
 	clk |= SDHCI_CLOCK_CARD_EN;